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+Set Primitive Projections.
+
+CoInductive stream A := { hd : A; tl : stream A }.
+
+CoFixpoint ticks (n : nat) : stream unit := {| hd := tt; tl := ticks n |}.
+
+Lemma expand : exists n : nat, (ticks n) = (ticks n).(tl _).
+Proof.
+  eexists.
+  (* Set Debug Tactic Unification. *)
+  (* Set Debug RAKAM. *)
+  reflexivity.